I have Rhode Island Reds, Buff Orpingtons, Australorps, Wyandottes, and Brahmas, and they all laid very well through the winter. I had eggs all winter long! I live in NC and we get pretty cold here, and mine did great. I am trying Speckled Sussex's and Partridge Rocks, this year, so since they aren't laying yet, don't know how they are going to do. Good luck
